Centrifugal machine



July 31 1934- D. JoNEs 1,968,491

CENTRIFUGLI MACHINE Filed Slept. 20, 1929 5 Sheets-Sheet 1 m P N m MT fIl? i S# i l fl Qu. i.; "fil n i w I 'Il' YS l; f@ f *2li i Q? l @d-BMMI I Mw j l L@ MQ N 12" Y lf muy u :VENTOR I "L" BY l l ffii. l l@ QVTfrirygpzruEY July 31, 1934.

D. JONES CENTRIFUGAL MACHINE 1 Filed sept. 2o. 1929 5 Sheets-Sheet 2Irl-1mm l.

INVE TOR @22a ,0. A BY g neu/M ATTORNEY July 3l, 1934. l.. D. JONESCENTRIFUGAL MACHINE Filed Sept. 20. 1929 5 Sheets-Sheet 3 Nk um mm .mm

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July 3l, 1934. 1 D. JONES CENTRIFUGAL MACHINE 5 Sheets-Sheet 4 FiledSept. 20. 1929 u lll INVENTOR l w Ad-1^, ATTORNEY July 3l, 1934. L. D.JoNEs CENTRIFUGAL MACHINE Filed Sept. 20. 1929 5 Sheets-Sheet 5 ORNEY@Hamm INVENToR 022., .0.

Patented July 3l, 1934 UNITED ,STATES PATENT ori-Ical l 15 Claims. (Cl.210-70) This invention relates to centrifugal machines and particularlyto mechanism :for dislodging or unloading from the rotor'thereof solidscollected therein as a result of separating solids from liq- 5 uidscentrifugally.

In the separation of solids from liquids centrifugally the removal fromthe rotor of the solids from which liquid has been separated, in such amanner that the separating operation l0 may be subject to a minimuminterruption is a difficult problem and even though apparatus may befound that is satisfactory with some materials that apparatus will notbe satisfactory with other materials.

to provide apparatus capable of removing solids continuously fromcentrifugal rotors but such apparatus is subject to similar defects.

It has been proposed to Vprovide a dislodging or cutting tool forremoving solids from centrifugal rotors during the rotation thereof, butdevices that have been proposed require extensive and careful control bythe operator and they are likely to injure' the rotor without effectingthe desired removal of solids therefrom. It has been proposedto employ adislodging or cutting tool that is provided with belt-driven operatingand reversing mechanism, but such devices require considerable skill andattention on the part of the operator; and, particularly when the toolis .'50 thought to be acting on cake but isnot, the inertia of themoving parts carries the tool past the points at which it should come torest and leads to injury or destruction of the rotor as a result ofunintended and unavoidable contact of the tool therewith, or the tool,particularly when acting upon cake, is not carried far enough andremoval of cake is incomplete. Attempts to limit tool movement in suchdevices by stops cause either binding or shocks difficult to absorb.

A feature of this inventionis that a. tool is employed whereby thesolids collected in a centrifugal rotor may be dislodged' therefrom`quickly without materially reducing the speed of rotation of the rotoror stopping it, and that tool is provided with operating mechanismwhereby the tool may be operated by an unskilled workman to effect thedesired removal of solids from.

the rotor without danger of injury to the rotor. Thus, features of thisinvention are thatthe `450 means for moving the tool is free of inertiathat will tendto carry the tool into engagement with the rotor; that thetool is prevented from moving into engagement with the rotor by stopsthat do not cause binding or wedgng when they come intov operation; thatthe operating mech- EffortsV have been made anismcarries the tool backand forth along the cylindrical interior surface of the solids in therotor and automatically reverses such motion of the tool before it comesinto engagement with the rotor; that the depth of cui made by the m01 1s60 readily adjusted and the means for adjusting the depth of cut isprovided with effective stops that cannot produce wedging or binding;that in the automatic reversal of the motion of the tool, the reversalof the force upon it is'full and complete 55- and automatic; that thecontrol of the movement of the tool back and forth across the bed ofsolids in the rotor can be effected by a single control member, and thatthe automatic mechanism can be so controlled as to bring the tool torest in a desired position at the end of each'dislodging operation.

This invention includes various features, some of which are set outabove and some of which are described hereinafter, which can be usedconjointly with advantage but which are also capable of separate use.Another feature of this invention is that the cutting or dislodging toolis fed by hydraulic means, back and forth, across the inner cylindricalsurface of the body of solid ma- 8 terial within the rotor. Anotherfeature is that a supply of liquid under pressure is maintained and itis fed alternately to opposite ends of one or more hydraulic cylinders.Another feature is that the admission of liquid to and the discharge ofliquid from opposite ends of the hydraulic cylinders is controlledautomatically by movement of the tool. Another feature is that theresulting reciprocation of the tool is controlled by a single controlelement. Another feature is that the single control element may consistof a by-pass leading from the pipe that carries liquid under pressure toone end of the cylinder, with the result that mere opening and closingof the by-pass will respectively cause or prevent continuedreciprocation of the tool, and the tool may be brought to rest in adesired position, preferably a position in whichit does not interferewith the separating operation.

In the drawings in whichlike reference characters indicate similarparts,

Fig. 1 is a view partly in section of a centrifugal machine i embodyingmy invention;

Fig. 2 is a plan view of the tool operating mechanism shown in Fig. 1;105

Figs. 3 and 4 are vertical sectional views of the apparatus shown inFig. 2; with the parts in different positions;

Figs. 3a and 4a are partial sectional views on the line Y-Y of Fig. 2r11 Fig. 5 is a sectional view on the line 5-5 of Fig. 4;

Fig. 6 is a partial sectional view on the line 6-6 Diris- 3:

Fig. a. partial sectional view on the line 7-7 of Fig. l;

Fig. 8 is a longitudinal sectional view on the line 8-8 of Fig. 2; and

Fig. 9 shows diagrammatically the arrangement of piping for theoperating liquid that is under the pressure.

While apparatus embodying my invention is subject to variousmodifications the following detailed description of the embodiment of myinvention shown in the drawings will assist in an understanding of myinvention and additional features of my invention will appear therefrom.

A centrifugal rotor 10 comprising a wall 1l, which may be of cylindricalor other suitable form and which may be perforated or imperforate, andan end wall 12 provided with an opening 13 and an end wall 14, ismounted upon shaft 15 carried in bearings 16 and 17 that are supportedby housing 18 that encloses the rotor. The shaft, and the attached rotormay be rotated in any suitable manner as by pulley 13. Liquid separatedcentrifugally from the solids is collected in the housing 18 andwithdrawn therefrom through outlet 20. The mixture of liq'uids withsolids, that is to be separated,'is supplied in any suitable manner tothe rotor 10 as by means of pipe-21 having a discharge s'lot 22. After acake of solids, of suitable radial depth, is formed in the rotor bydraining or by sedimentation or by both such operations, and aftersupply of mixture to the rotor is discontinued, and after any timeinterval that may be desirable to effect further separation of liquidfrom the solids, the solids are dislodged from the rotor as hereinafterdescribed during the rotation of the rotor, and the dislodged solidsfall into.a hopper, the position of which is generally indicated by thelines 23, the hopper extending through a suitable opening 1n casing 18and havy ing an outlet 24 for the solids.

The means for supporting and moving the dislodging or cutting tool 25may be mounted inany manner, in proper relation to rotor 11, asv bybolting the flange or base plate 26 thereof in position over the opening27 in the housing 18. Tool 25 is attached to and supported by thetool-operating bar or member 28 that is mounted for reciprocation androtation in the bearings 29 and 30 that are carried by the frame 31 thatis connected to the flange or base plate 26. Bearing is provided at theend thereof adjacent the vrotor with a stuffing box that preventsentrance into the bearing of foreign materials such as liquids andsolids introduced into rotor 11, said stufling box comprising packing311 that is compressed by compression member 32 upon tightening of bolts33, only one of which is shown. Between bearings 29 and 30 the frame 31is spaced from bar 28 to provide a space 133 around bar 28 and is tedcircle 36 in Fig. 7, tool 25 is maintained, by

suitable rotation of bar 28, in a position in which it will not engagethe surface of the cake, such a position being indicated by dotted linesin Fig. 7. After a cake of sufficient depth has been formed bar 28 isrotated, clockwise in Fig. 7, to carry the cutting edge of the tool intothe cake and toward the inner surface of rotor ll. For this purpose bar28 is provided with a keyway 37 in which fits key 38 carried byworm-wheel 39 housed in frame 31 between bearings 29 and 35. Shaft 40 ismounted in frame 31 for rotation and carries a Aworm 41 engagingworm-wheel 39. Shaft 40 is also provided with gear 42 which is engagedby gear 43 mounted on shaft 44 to which is secured gear 45 which in turnengages rack 46. Rack 46 slides within auxiliary housing 310 and theextent to which it may slide is limited at each end of its motion bymeans of stops 47 and 48, which in the construction shown are adjustedby being screwed into the ends of auxiliary housing 310 and locked inposition by lock nuts 49. In the construction shown rod 50 is secured torack 46 and passes through one end of auxiliary housing 310, as bypassing through stop 47, and rod 50 carries on its end a piston 51 thatis located within hydraulic cylinder 52. Liquid under pressure issupplied by pipe 5 3 to four-way valve 54 and, according to the settingof valve 54 liquid under pressure is carried to one end of cylinder 52and from the other end thereof by pipes 55, liquid so discharged fromcylinder 52 being returned to the source of liquid supply by pipe 56.Thus, when operating handle 57 of four-way valve 54 is in the positionshown vin Fig. 1, liquid under pressure will be passed to the right handend of cylinder 52 to swing tool 25 from the position shown in dottedlines to the position shown in full lines in Fig. 7. When the operatinghandle 57 is swung into the position indicated in dotted lines in Fig. 1the rotational movement of bar 28 will be in the opposite direction. The.cut ting adjustment of tool 25 may also be effected by hand-wheel 58mounted on shaft 40.

In the construction described, for rotating rod 28 and thereby adjustingits cutting position, the limiting positions of cutting tool 25 aredetermined by the position of stops 47 and 48. Thus f regardless ofwhether the position of tool 25 is adjusted by controlling the-supply ofliquid to engagement of the ends of the sliding rack 46 with' the stops47 and 48 and no binding or wedging can occur, as would be the case ifthe stops acted upon some part (e. g. worm-wheel 39) that is movedthrough a worm and worm-wheel. Thus while rack 46 contributes to theadjustment of tool 25' when that adjustment is effected by hydrauliccylinder 52, and also contributes then to the limiting of thatadjustment, it also constitutes a non-binding stop when adjustment iseffected by movement of hand wheel 58.

For the purpose of carrying cutting tool 25 back and forth across thecake in rotor 11 in a direction parallel to the axis of the rotor,hydraulic means is provided. In the construction shown this meanscomprises hydraulic cylinders 59 and 60 within which are located pistons61 provided with piston rods 62 that extend through stuffing boxes 63.In the construction shown, cylinders 31. To assist in holding cylinders59 and 60 in position long bolts 68 pass through cylinder heads 65 andthrough cylinder heads 64 rand are threaded into flange or base plate26. Tooloperating bar 28 is formed with a portion 69 that is of reduceddiameter and a bushing 70 fits thereon and rests againstl the resultingshoulder and is prevented from rotating on bar 28 by pin 71. Yoke 72 isprovided with an opening within which bushing 70 rotates, and nut '73acts to hold yoke '72 in place on bushing '70. A washer 74 lies betweennut 73 and yoke 72 and has a tongue extending into slot 75 in bar 28 tothe end that rotation of bar 28 within yoke 72 will not cause nut 73 tobe unscrewed. The outer ends of piston rods 62vare secured in yoke 72 asshown in Fig. 2 and motion of piston 61 is thereby imparted to rod 28 toeffect movementof the tool across the face of the cake in rotor l1..Plate 76, which is triangular in the construction shown in Fig. 5 isheld in fixed position with respect to frame 31 by being bolted to thethree rods 77 that are threaded into frame 3l. As shown in Fig. 3 yoke721s provided with a downward extension '78 having an opening thataccommodates the lowermost of rods 77, yoke 72 being thereby heldagainst rotation in the event that rotation of bar 28 tends to causerotation of yoke 72.

Stop member 79 engages the end of bearing 35 to limit the movement ofbar 28 into the rotor (to the right in Fig. 3) and is threaded upon bar28 in order that its, position thereon may be adjusted, and isheld inadjusted position on bar 28'b`y set screw 80. Stop member 81 engagesplate 76 and limits the outward movement of bar 28 (movement of bar 28to the left in Fig. 4), being threaded upon bar 28 for adjustment andbeing held in adjusted position by set screw 82.

From the foregoing it will be apparent that by admitting liquid underpressure alternately to oppositeA ends of cylinders 59 and 60, tool 25will be moved back and forth across the cake in rotor 11and that theengagement of stop 79 with bearing 35 will adjustably limit the extentof such movement in one direction while engagement of stop 81 with plate76 will adjustably limit that movement in the other direction, and thatbar 28 may be rotated to adjust the distance of the tool from the innersurface of the rotor without imparting rotation to any part of thehydraulic toolreciprocating mechanism. Worm-wheel 39, which rotates bar28, is so located intermediate the ends of bar 28 that keyway 37 neverpasses within or through packing 311 or into a position in whichmaterial treated in the rotor might lodge within that keyway.

Mechanism is provided whereby predetermined reciprocation of tool-bar 28in each direction will cause a discontinuance of supply of liquid underpressure to one end of cylinders 59 and 60 and an initiation of suchsupply to the other end of those cylinders, and cause a correspondingreversal of the discharge of liquid from the opposite ends of thosecylinders. And, such mechanism effects a complete and rapid reversal,the supply to one end of the cylinders being suddenly and completelydiscontinued and the supply to the other end of the cylinders beingsuddenly and completely initiated. The circulating system for theoperating liquid is shown in Fig. 9. A supply of liquid, preferably oil,is maintained in tank 83, and pump 84 driven by motor 85 delivers theliquid under pressure into supply pipe 86 and by means of throttle valve87 the rate of flow of liquid under pressure to four-way-valve 88 iscontrolled.

Fromv four-way-valve 88, pipes 89 communicate with one end of cylinders59 and 60 and pipes 90 communicate Ywith the other end of thosecylinders and pipe 91 leads through relief valve 92 back to supply tank83. Liquid supplied under pressure by pump 84 that is in excess ofliquid permitted to pass throttle valve 87 is returned to tank 83 bypipe 186 in which pressure relief valve 187 isl positioned. From thepipes there leads to the return pipe 91, a by-pass 93 that is controlledby valve 94 and contains relief valve 194. The internal construction ofvalve 88 appears in Figs. 3a and 4a. When movable member 95 of valve 88is in the position shown in Fig. 3a liquid under pressure will pass frompipe 86 through passage 96 into pipes 89 and tothe right hand ends ofcylinders 59 and 60 and liquid will pass from the left hand ends ofthose cylinders through pipes 90 and through passage 97 of movablemember 95 into return pipe 91. Provided by-pass-valve 94 is closed,shifting of movable member 95 counterclockwise until passage 96 leadsfrom pipes 89 to return 91 and passage 97 leads from supply pipe 86 topipes 90 as shown in Fig. 4a, will cause liquid under pressure to besupplied to the lefthand ends of those cylinders and permit liquid to bedischarged from the right-hand end of those cylinders into return pipe91. Automatic mechanism is hereinafter described for effecting movementof movable member 95 back and forth from one of the adjustments vabovedescribed to the 94 is open instead of entering the left hand end' ofthe cylinders. If then valve 94 is closed liquid under pressure willstop passing through pipe 93 and will enter the left hand end of thecylinders. If, however, by-pass-valve 94 is opened tool 25 will'4 stopin the position shown in Fig. 1,11 it is then in that position, or itwill continue its motion to the left until it comes to that position ifvalve 94 is open as the tool is moving from right to left in Fig. 1.Inasmuch as the reversing mechanism reverses the position of valve 88 ateach end of the stroke of tool 25, the mere closing of valve 94 willcause reciprocation of tool 25 to begin and the mere opening of valve 94will cause reciprocation of tool 25 to discontinue. By opening valve 94at the end of a cake dislodging operation when tool 25 is moving fromright to left iny Fig. 4, tool 25 will come to the position shown inFigs. 1 and 4 and stop in preparation for the next separating andcake-forming operation.

The automatic reversing mechanism comprises rod 96, one end of which issupported for sliding in plate v76 and the other end of which issupported by a pivot on rocker arm 97 which is plvoted to bracket 98,carried by frame 31. Contact members 99 are threaded upon rod 96 inorder that their position thereon may be so adjusted that they will besuitably engaged by lug 101 on yoke '72 at predetermined points in thestroke of tool 25. This lug may be carried by any of the reciprocatingparts. Pivoted to the opposite end of rocker arm 97 is link 102 that ispivotally connected to one end of valve-operating bar 103 supported forsliding in auxiliary frame 104 that is mounted upon frame 3l. Movablemember 95 of four-way-valve 88 is attached to shaft 105 to which issecured arm 106 carrying roller 107. Rod 103 is provided with arms 108and 109 for cooperating with roller 107 to swing arm 106 and rotatemovable member 95 of valve 88. Rod 103 is provided with a projection 110which cooperateswith a projection 111 on lever 112 that is pivoted at113 and pressed upwardly by spring 114. 'I'hese parts are shown in Figs.l and 4 in the position in which they lie when tool is moving to theright and valve 88 is inthe setting shown in Fig. 4a.

As tool 25 approaches the limit of its movement to the right, lug 101will engage stop 99 at the right-hand end of bar 96 and cause bar 103 tomove to the left until the apex of projection 110 snaps over the apex ofprojection 111 and then a quick and complete movement of rod 103 to theleft will occur as projection 110 rides down the left-hand slope ofprojection 111, due to the action of spring 114, and the parts will bebrought to the position shown in Fig. 3; and the engagement of arm 109with roller 107 will have caused valve member to be given a quick andcomplete clockwise movement to the position shown in Fig. 3a. Thereupontool 25 will be moved to the left in Fig. 3 until lug 101 strikescontact member 99 at the left hand end of rod 96 and causes bar 103 tomove to the right until the apex of projection 110 snaps over the apexof projection 111 into the position shown in Figs. 1 and 4. Theresulting action of arm 108 on roller 107, swings valve operating arm106 to the position shown in Figs. land 4, and arm 106 rotates shaft 105counter-clockwise and reverses the position of valve member 95 to theposition shown in Fig. 4a and causes liquid under pressure to beadmitted again to the left-hand end of cylinders .59 and 60 and tool 25will move to the right. Arm 106 is provided with an extension 116 thatengages cushioning stops at the limiting positions of arm 106 when theparts of valve 88 are in register in the settings shown in Figs. 3a and4a. These stops may be of any suitable construction but are shown in thedrawings simply as lugs 117 in which are adjustably threaded the screws118 that engage extension 116.

This hydraulic reciprocation of the Vtoolnwith.

farther into the cake thereon, by admitting liquid under pressure to theright-hand end of cylinder 52,through proper adjustment of valve 57, orby rotating hand-wheel "58 counter-clockwise. When the removal of thecake is completed, liquid under pressure is admitted to the left-handend of cylinder 52 or hand-wheel 58 is rotatedclockwise until tool 25 isbrought to the position shown in dotted lines in Fig. 7. Stops 47 and 48prevent rotation of tool 25 to a point at which it engages the innersurface of rotor 11; and stops 79 and 81. positively prevent, withoutbinding or wedging, reciprocation of tool 25 from bringing tool 25 intoengagement with the side walls of rotor 11.- The force transmitted whenany of these stops come into. operation is transmitted by contact of ailat face with another hat face and no force is applied through aworm-wheel or any other construction that'might cause a binding orwedging to occur when the stops come into action.

While I have described certain embodiments of my invention in greatdetail in order to assist in a full understanding thereof, I do notintend that my invention shall be limited to such details but that itshall include such modifications and variations as fall within theappended claims.

I claim:

1. In a device for the removal of solids from the rotor of a centrifugalmachine, a solid-dislodging'tool for movement along the inner wall ofthe rotor, hydraulic means for moving said tool in opposite directions,a-pipe for supplying liquid under pressure to said means, a throttlevalve for controlling the rate of flow of liquid in said pipe towardsaid means, and a valved bypass leading from said pipe between saidthrottle valve and said means.

2. In a device for the removal of solids from the rotor of a centrifugalmachine, a solid-dislodging tool for movement along the inner wall ofthe rotor, a hydraulic cylinder having a piston connected to said toolfor the movement thereof, a valve adjustable to settings respectivelycausing liquidl under pressure to enter opposite ends of said cylinder,a by-pass for diverting liquid passed by said valve to one end of saidcylinder, and a valve controlling the ilow of fluid through said by-passto control lthe movement of said piston.

3. In a device for the removal of solids from the rotor `of acentrifugal machine, a solid-dislodging tool for movement along theinner wall of the rotor, a tool-moving member carrying said tool, ahydraulic cylinder, a piston in said cylinder and having a piston rod,and a part connected to said rod and swiveled to said member fortransmitting movement of said rod to said member.

4. In a device for the removal of solids from the rotor of a centrifugalmachine, a solid-dislodging tool for movement along the inner wall 11 ofthe rotor, a tool moving membercarrying said tool, a hydraulic cylinder,a piston in said cylinder and having a 'piston rod, a part mounted onsaid member for relative rotation and fixed against longitudinalmovement with respect thereto and connected 'to said rod, and means foreffecting a relative rotation between said part and said member.

5. In a devicefor the removal of solids from the rotor of a centrifugalmachine, a solid-dislodging tool for movement along the inner wall ofthe rotor, a member supporting said tool and mounted for reciprocationand rotation, means for rotating said member, a reciprocating rod, meansconnecting said rod and said member for relative rotation, and meanspreventing rotation of said member from rotating said connecting means.

6. In a device for the removal of solids from the rotor of a centrifugalmachine, a soli -dislodging tool for movement along the inner wall ofthe rotor, a member supporting said tool and mounted for reciprocationand rotation. means for rotating said member, a reciprocating rod, meansconnecting said rod and said member, for relative rotation, and a guideconstraining said connecting means to reciprocating motion.

7. In a device for the removal of solids from the rotor of a centrifugalmachine, a solid-dislodging tool for movement along the inner wall ofthe rotor, hydraulic means for operating said tool, a source of supplyof liquid under pressure for said hydraulic means, a pipevleading fromsaid source to said hydraulic means, a throttle valve in said pipe, anda relief by-pass leading from and pipe et u. point between ma throttlevalve and said source of supply.

8. In a device for the removal oi solids from the rotor oi a centrifugalmachine, a solid-dislodging tool tor movement along the inner wall ofthe rotona tool holder. and a bearing adjacent said rotor andsupporting-said tool holder and having an opening intermediate its endsfor the 'discharge' of foreign matter entering one end of the bearing.

9. In a device for the removal of solids from thel rotor o! acentrifugal machine, a solifl--dislodgingtool for movement alongutheinner wall oi the rotor, a bar supporting said tool and having alongitudinal key slot extending away from said 10. In a device iortheremoval oi solids from4 the rotor of a centrifugal machine, asolid-dislodging tool for. movement along the inner wall oi the rotor, atool holder mounted for rotation to carry said tool toward and from thecake of solids in the rotor, irreversible means including a drivingmember and a driven member for rotating' said holder, and stops limitingthe extent 'of movement oi said driving member. v

l1. In a device for the removal o! solids from the rotoroi a centrifugalmachine, a solid--dis- -lodging tool for movement along the inner walloi' the rotor, a tool holder mounted for rotation to carry said tooltoward and from the cake of solids in the rotor, means ior rotating saidholder, comprising a worm and worm-wheel, a rack and non-binding stopsfor limiting theY movement oi' saldi-aok. Y- e A12. In a device foi-theremoval of solids from the rotor of a centrifugal machinessolid-dislodging tool for movement along the inner wall of the rotor, atool holder mounted for rotation to carry said tool toward and trom thecake of solids in the rotor. a worm-wheelv keyed to said holder', a wormengtins said worm-wheel, and non-binding means for limiting rotation otsaid worm while permitting more than a iull rotation thereof.

13. In a device for the removal o! solids from the rotor of acentrifugal machine, a' solid-dislodging tool, a hydraulic ,cylinder forreciprocat-l ing said tool. conduits respectively conducting iiuid toopposite ends of said cylinder and a by pass leading from one of saidconduits.

14. In a device for the removal of solids from the rotor of acentrifugal machine, a solid-dis :lodging tool. a hydraulic cylinder iorreciprocating said tool, conduits respectively conductingiiuid toopposite ends oi' said cylinder, means controlled by movement of saidtool for directing iiuid alternately into said conduits, anda by-passleadingirom one of said conduits.

i5. In a device for the removal oi solids from the rotor of acentrifugal machine, a solid-dislodging tool, a hydraulic cylinder forreciprocating' said tool, conduits respectively conducting iluid toopposite ends oi. said cylinder, means controlled by movement of saidtool tor directing fluid alternately into said conduits, and a by-passleading from that one of said conduits through which iluid is flowinginto said cylinder dining movement of the tool into the rotor.

LEO D. JONES.

